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Monitoring of 2‐D Combustion Temperature Images in a 670 t/h Utility Boiler and Simulation of its Application in Combustion Control
Author(s) -
Zhou H.C.,
Zhang S.S.,
Huang Y.L.,
Zheng C.G.
Publication year - 2000
Publication title -
developments in chemical engineering and mineral processing
Language(s) - English
Resource type - Journals
eISSN - 1932-2143
pISSN - 0969-1855
DOI - 10.1002/apj.5500080310
Subject(s) - boiler (water heating) , combustion , pyrometer , superheater , control theory (sociology) , control system , engineering , coal , automotive engineering , nuclear engineering , temperature measurement , waste management , chemistry , computer science , thermodynamics , electrical engineering , control (management) , physics , organic chemistry , artificial intelligence
A simple method of monitoring 2‐D temperature images from monochromatic gray images of flames captured from utility boilers, and reference temperatures measured by two‐color pyrometry, are presented in this paper. In a 670 t/h utility coal‐fired boiler furnace, the magnitude of the combustion temperature fluctuation can reach as high as 180 K under normal conditions. Furthermore, a two‐loop combustion control strategy was proposed with steam pressure as its outer‐loop control variable and the radiant energy signal as the inner‐loop control variable. Simulation on the single‐and two‐loop control strategies clearly indicates that the two‐loop control strategy can realize a more economical utilization of fuel. It also ensures steady steam pressure and safer conditions for the superheater surface tubes (not to be overheated) making the boiler respond quickly to the load change.